CN204425312U - A kind of input and output time-sharing multiplex circuit - Google Patents
A kind of input and output time-sharing multiplex circuit Download PDFInfo
- Publication number
- CN204425312U CN204425312U CN201420695902.7U CN201420695902U CN204425312U CN 204425312 U CN204425312 U CN 204425312U CN 201420695902 U CN201420695902 U CN 201420695902U CN 204425312 U CN204425312 U CN 204425312U
- Authority
- CN
- China
- Prior art keywords
- led
- contact
- connector
- field effect
- effect transistor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Electronic Switches (AREA)
Abstract
The utility model discloses a kind of input and output time-sharing multiplex circuit, comprise some groups of parallel circuitss, often organize parallel circuits and comprise a LED parallel with one another and a key switch, it is characterized in that the LED negative pole end often organizing parallel circuits is all connected with the I/O mouth of a MCU, the LED positive terminal of each group of parallel circuits is all connected with button Enable Pin, described button Enable Pin passes through grounding through resistance, button Enable Pin is connected with the drain electrode of field effect transistor, the grid of field effect transistor is connected with LED Enable Pin, and the source electrode of field effect transistor connects positive source.Therefore the utility model has the advantage of the use that can reduce PCB cabling and connector contact, reduce manufacturing cost.
Description
Technical field
The utility model relates to the user operation display panel of coffee machine, is specifically related to a kind of input and output time-sharing multiplex circuit.
Background technology
The user operation of coffee machine is display panel used to a large amount of LED and key switch, and in general, each LED and key switch all need a control line, therefore need a large amount of cablings to carry out practical function.So just need PCB cabling space large as far as possible, the pin number of connector also needs very large, and for controller MCU, also need a lot of I/O mouths, therefore manufacturing cost is higher.
Utility model content
The purpose of this utility model is to provide a kind of input and output time-sharing multiplex circuit for coffee machine user operation display panel, can save PCB cabling and connector contact.
To achieve these goals, the technical solution of the utility model is as follows: a kind of input and output time-sharing multiplex circuit, comprise some groups of parallel circuitss, often organize parallel circuits and comprise a LED parallel with one another and a key switch, it is characterized in that the LED negative pole end often organizing parallel circuits is all connected with the I/O mouth of a MCU, the LED positive terminal of each group of parallel circuits is all connected with button Enable Pin, described button Enable Pin passes through grounding through resistance, button Enable Pin is connected with the drain electrode of field effect transistor, the grid of field effect transistor is connected with LED Enable Pin, the source electrode of field effect transistor connects positive source.When LED Enable Pin is touched effective, when button Enable Pin lost efficacy, LED uses the output state of the I/O mouth of MCU, and when button Enable Pin is effective, and when LED Enable Pin touches inefficacy, then, then button uses the input state of the I/O mouth of MCU.
In this embodiment, first connector and the second connector are respectively equipped with at least three contacts, described three contacts are respectively the second contact, 4th contact and the 6th contact, the negative pole of the one LED and one end of the first key switch are connected with the 4th contact of the second connector, the negative pole of the 2nd LED and one end of the second key switch are connected with the second connector the 6th contact, 4th contact of the first connector is all connected with the I/O mouth of MCU with the 6th contact, the other end of the first button, the positive pole of the one LED, the other end of the second key switch, the positive pole of the 2nd LED is all connected with the second contact of the second connector, second contact of the first connector is connected with button Enable Pin, described button Enable Pin passes through grounding through resistance, second contact of the first connector is connected with the drain electrode of field effect transistor, the grid of field effect transistor is connected with LED Enable Pin, the source electrode of field effect transistor connects positive source.The drain electrode of described field effect transistor is also connected with the positive pole of diode, and the source electrode of described field effect transistor is connected with the negative pole of described diode, and the grid of described field effect transistor is connected with the positive pole of voltage-stabiliser tube, and the source electrode of field effect transistor connects the negative pole of described voltage-stabiliser tube.
According to specific embodiment of the utility model, described first connector and the second connector are provided with eight contacts, first contact of the first connector connects positive source, second contact of the first connector is connected with button Enable Pin, 3rd contact of the first connector, 4th contact, 5th contact, 6th contact, 7th contact is connected with five I/O mouths of MCU respectively, 8th contact of the first connector is connected with the collector electrode of triode, the grounded emitter of triode, the base stage of triode connects another I/O mouth of MCU by a resistance, first contact of the second connector and the 3rd LED, 4th LED, 5th LED, the positive pole of the 6th LED connects, second contact of the second connector and a LED, the positive pole of the 2nd LED and the first key switch, one end of second key switch connects, 3rd contact of the second connector is connected with the negative pole of the 3rd LED, 4th contact of the second connector is connected with the negative pole of the 2nd LED and the second key switch, 5th contact of the second connector is connected with the negative pole of the 4th LED, 6th contact of the second connector is connected with the negative pole of a LED and the first key switch, 7th contact of the second connector is connected with the negative pole of the 5th LED, 8th contact of the second connector is connected with the negative pole of the 6th LED.
The utility model achieves the Signal transmissions of a LED, the 2nd LED, the first key switch and the second key switch by the second contact, the 4th contact and contact, three, the 6th contact and cabling thereof, utilize the control to LED Enable Pin and button Enable Pin, achieve and utilize a set of contact to carry out input and output time-sharing multiplex, save PCB cabling and connector contact, reduce the I/O mouth quantity of the MCU used.Therefore the utility model has the advantage of the use that can reduce PCB cabling and connector contact, reduce manufacturing cost.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of display panel.
Fig. 2 is the control circuit figure of display panel.
Embodiment
This part circuit is applicable to a lot of design occasions of user operation display interface.
This design drawing is the user operation display interface for coffee machine.Usually for display panel design used 6 LED lamp and 2 key switches here, be referred to as the first LED DL1, second LED DL2,3rd LED BLUE, the 4th LED RED, the 5th LED GREEN, 6th LED D8, first key switch SW1, the second key switch SW2, we need 10 cablings to realize this function so usually.But we achieve this function by the principle of time-sharing multiplex with 8 lines here.
As shown in the figure, described first connector and the second connector are provided with eight contacts, first contact of the first connector connects positive source, second contact of the first connector is connected with button Enable Pin EN_KEY_cmd, described button Enable Pin passes through grounding through resistance, second contact of the first connector is connected with the drain electrode of field effect transistor, the grid of field effect transistor is connected with LED Enable Pin EN_LED_cmd, the source electrode of field effect transistor connects positive source, 3rd contact of the first connector, 4th contact, 5th contact, 6th contact, 7th contact (is respectively LED_BLUE_cmd with five I/O mouths of MCU respectively, LED_KEY_SHORT_cmd, LED_RED_cmd, LED_KEY_LONG_cmd, LED_GREEN_cmd) connect, 8th contact of the first connector is connected with the collector electrode of triode, the grounded emitter of triode, the base stage of triode connects another I/O mouth of MCU by a resistance, first contact of the second connector and the 3rd LED BLUE, 4th LED RED, 5th LED GREEN, the positive pole of the 6th LED D8 connects, second contact of the second connector and the first LED DL1, the positive pole of the second LED DL2 and the first key switch SW1, one end of second key switch SW2 connects, 3rd contact of the second connector is connected with the negative pole of the 3rd LED BLUE, 4th contact of the second connector is connected with the negative pole of the second LED DL2 and the second key switch SW1, 5th contact of the second connector is connected with the negative pole of the 4th LED RED, 6th contact of the second connector is connected with the negative pole of the first LED DL1 and the first key switch SW1, 7th contact of the second connector is connected with the negative pole of the 5th LED GREEN, 8th contact of the second connector is connected with the negative pole of the 6th LED D8.Described field effect transistor adopts the field effect transistor FDV304P of P raceway groove.
Further, the lamp just related to and switch more, so more can embody the advantage of this design.This design is not only save the cabling space of PCB, and connector also can select few PIN number, also can save much exactly in addition for the quantity of MCU, I/O mouth.Also relatively decline for selecting the one-tenth of MCU originally to say like this.
From drawing, we can see 2 the pin EN_LED_cmd come from mainboard, and EN_KEY_cmd can realize 4 functions.When EN_LED is low level " 0 ", EN_KEY be high level " 1 " so these two lamps of DL1, DL2 be just in ON state, now the PIN4/PIN6 of connector J2 is as output, and is low level " 0 ".Another state is low level " 0 " as EN_KEY exactly, and EN_LED is high level " 1 ", and now pin4/pin6 is as input, and is high level, and SW1, SW2 are in running order.This switch command is inputted by single-chip processor i/o mouth.LED_KEY_SHORT and LED_KEY_LONG respectively, short time is pinned switch and pins switch for a long time. and in simple terms, for this part circuit of DL1/DL2/SW1/SW2, the time LED of 50% is in work, the time of other 50% is that switch is working, and the instruction of opening and closing is controlled by MCU.Such design can make when short time driving LED & KEY, and user does not feel the state that the flicker of LED and KEY neither be in active always.
Such design is for a lot of household electrical appliance, and what relate generally to user interface is all applicable.The utility model can reduce cabling quantity, reduces connector contact, reduces the use of single-chip processor i/o mouth, if we want driving N LED, a M KEY, and cabling quantity=max (M, N)+1 that such design needs; And common words need quantity=M+N+1, so be all advantageous for the PIN number of saving PCB space and connector.
Claims (4)
1. an input and output time-sharing multiplex circuit, comprise some groups of parallel circuitss, often organize parallel circuits and comprise a LED parallel with one another and a key switch, it is characterized in that the LED negative pole end often organizing parallel circuits is all connected with the I/O mouth of a MCU, the LED positive terminal of each group of parallel circuits is all connected with button Enable Pin, described button Enable Pin passes through grounding through resistance, button Enable Pin is connected with the drain electrode of field effect transistor, the grid of field effect transistor is connected with LED Enable Pin, the source electrode of field effect transistor connects positive source, first connector and the second connector are respectively equipped with at least three contacts, described three contacts are respectively the second contact, 4th contact and the 6th contact, the negative pole of the one LED and one end of the first key switch are connected with the 4th contact of the second connector, the negative pole of the 2nd LED and one end of the second key switch are connected with the second connector the 6th contact, 4th contact of the first connector is all connected with the I/O mouth of MCU with the 6th contact, the other end of the first button, the positive pole of the one LED, the other end of the second key switch, the positive pole of the 2nd LED is all connected with the second contact of the second connector, second contact of the first connector is connected with button Enable Pin, described button Enable Pin passes through grounding through resistance, second contact of the first connector is connected with the drain electrode of field effect transistor, the grid of field effect transistor is connected with LED Enable Pin, the source electrode of field effect transistor connects positive source.
2. input and output time-sharing multiplex circuit as claimed in claim 1, it is characterized in that the drain electrode of described field effect transistor is also connected with the positive pole of diode, the source electrode of described field effect transistor is connected with the negative pole of described diode, the grid of described field effect transistor is connected with the positive pole of voltage-stabiliser tube, and the source electrode of field effect transistor connects the negative pole of described voltage-stabiliser tube.
3. input and output time-sharing multiplex circuit as claimed in claim 1, is characterized in that described field effect transistor adopts the field effect transistor FDV304P of P raceway groove.
4. input and output time-sharing multiplex circuit as claimed in claim 1, it is characterized in that described first connector and the second connector are provided with eight contacts, first contact of the first connector connects positive source, second contact of the first connector is connected with button Enable Pin, 3rd contact of the first connector, 4th contact, 5th contact, 6th contact, 7th contact is connected with five I/O mouths of MCU respectively, 8th contact of the first connector is connected with the collector electrode of triode, the grounded emitter of triode, the base stage of triode connects another I/O mouth of MCU by a resistance, first contact of the second connector and the 3rd LED, 4th LED, 5th LED, the positive pole of the 6th LED connects, second contact of the second connector and a LED, the positive pole of the 2nd LED and the first key switch, one end of second key switch connects, 3rd contact of the second connector is connected with the negative pole of the 3rd LED, 4th contact of the second connector is connected with the negative pole of the 2nd LED and the second key switch, 5th contact of the second connector is connected with the negative pole of the 4th LED, 6th contact of the second connector is connected with the negative pole of a LED and the first key switch, 7th contact of the second connector is connected with the negative pole of the 5th LED, 8th contact of the second connector is connected with the negative pole of the 6th LED.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420695902.7U CN204425312U (en) | 2014-11-19 | 2014-11-19 | A kind of input and output time-sharing multiplex circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420695902.7U CN204425312U (en) | 2014-11-19 | 2014-11-19 | A kind of input and output time-sharing multiplex circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204425312U true CN204425312U (en) | 2015-06-24 |
Family
ID=53475640
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420695902.7U Expired - Fee Related CN204425312U (en) | 2014-11-19 | 2014-11-19 | A kind of input and output time-sharing multiplex circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204425312U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105530728A (en) * | 2016-02-24 | 2016-04-27 | 西南交通大学 | Bus-current synchronous time-sharing multiplexing multi-channel constant current output LED driver topology and control method therefor |
| CN107241115A (en) * | 2017-06-27 | 2017-10-10 | 歌尔科技有限公司 | A kind of separate type call bracelet |
| CN109496021A (en) * | 2019-01-09 | 2019-03-19 | 厦门安斯通微电子技术有限公司 | A kind of LED light control of zero quiescent current and key-press input time-sharing multiplex circuit |
| CN109688656A (en) * | 2018-11-28 | 2019-04-26 | 珠海市杰理科技股份有限公司 | Key time multiplexing circuit and chip circuit |
-
2014
- 2014-11-19 CN CN201420695902.7U patent/CN204425312U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105530728A (en) * | 2016-02-24 | 2016-04-27 | 西南交通大学 | Bus-current synchronous time-sharing multiplexing multi-channel constant current output LED driver topology and control method therefor |
| CN107241115A (en) * | 2017-06-27 | 2017-10-10 | 歌尔科技有限公司 | A kind of separate type call bracelet |
| CN107241115B (en) * | 2017-06-27 | 2022-06-14 | 歌尔科技有限公司 | Disconnect-type conversation bracelet |
| CN109688656A (en) * | 2018-11-28 | 2019-04-26 | 珠海市杰理科技股份有限公司 | Key time multiplexing circuit and chip circuit |
| CN109688656B (en) * | 2018-11-28 | 2021-03-19 | 珠海市杰理科技股份有限公司 | Key time division multiplexing circuit and chip circuit |
| CN109496021A (en) * | 2019-01-09 | 2019-03-19 | 厦门安斯通微电子技术有限公司 | A kind of LED light control of zero quiescent current and key-press input time-sharing multiplex circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN204425312U (en) | A kind of input and output time-sharing multiplex circuit | |
| CN103699511A (en) | Interface device for serially writing programs in multiple MCUs (micro control units) | |
| CN202102275U (en) | IO port expansion circuit | |
| CN201583940U (en) | Device for indicating running state of network and network terminal | |
| CN203659000U (en) | Multi-USB-interface-type compatible interface circuit and intelligent information terminal | |
| CN202551001U (en) | Electronic switching circuit | |
| CN203167366U (en) | Backlight circuit and backlight keyboard | |
| CN202886881U (en) | Full-hardware startup and shutdown circuit | |
| CN204792788U (en) | Electric leakage protection circuit | |
| CN202798970U (en) | HDMI (high-definition multimedia interface) device | |
| CN204668646U (en) | A kind of Multifunction timed controls socket | |
| CN203645893U (en) | Multi LED display circuit based on single chip microcomputer less port control | |
| CN208353651U (en) | A kind of touch adjusting control circuit of constant voltage source | |
| CN203616752U (en) | Serial port expanding device | |
| CN205456626U (en) | Old man's stick with illumination function | |
| CN204104023U (en) | Based on the quick supervisory keyboard of DVR | |
| CN108513404A (en) | A kind of touch adjusting control circuit of constant voltage source | |
| CN205051669U (en) | Power tube drive integrated circuit | |
| CN204833939U (en) | Touch charactron | |
| CN204089767U (en) | Level match module and electronic product | |
| CN207410571U (en) | A kind of RGB cabinets control circuit | |
| CN215815124U (en) | Single IO mouth many button detection circuitry based on many charactron | |
| CN203573619U (en) | Two-digit nixie tube display system for high-voltage presence indication device | |
| CN202795852U (en) | Electric solenoid displaying current direction | |
| CN102929161A (en) | Full hardware startup and shutdown circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150624 Termination date: 20151119 |
|
| EXPY | Termination of patent right or utility model |